A cookie is a file that is downloaded to your computer to access certain web pages. Cookies allow, among other things, record user activity anonymously to the website so allowing to remember certain settings and information about the user in order to have a more personalized website, set preferences, and data analysis.
Third-party cookies are as follows:
(Third-party cookies are those sent to the user's terminal computer from a machine or domain that is not managed by the editor, but by another entity that processes data obtained from cookies)
The Website may use information about your visits to conduct assessments and statistical calculations on anonymous data, and to ensure the continuity of service or to make improvements to their websites.
Two persistent cookies (PREF & NID) set by Google Maps applications and managed by Google.
Some services can use connectors with social networks such as Facebook or Twitter.
When the user registers a service with a social network credentials you are authorizing save a persistent cookie that remembers your identity and ensures access to the Services. The user can delete this cookie and revoke access to the Services updating your preferences in specific social network. Sometimes you can add pictures and videos from sites like YouTube, Flickr ... Therefore, if you visit a page with content integrated cookies, they may be displayed in your device (for information on them you'll have to check the corresponding website for thirds).
In the following links, how to manage cookies is explained for different web browsers:
Chorme, from http://support.google.com/chrome/bin/answer.py?hl=es&answer=95647
Explorer, from http://windows.microsoft.com/es-es/windows7/how-to-manage-cookies-in-internet-explorer-9
Firefox, from http://support.mozilla.org/en-US/kb/enable-and-disable-cookies-website-preferences
Safari, from http://support.apple.com/kb/ph5042
Further information about cookies in the following links: